低NO_x旋流煤粉燃烧器气固两相流模拟
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摘要
为提高旋流煤粉燃烧器稳燃与燃尽性能,降低NO_x排放。通过数值模拟方法研究了在中心风速4～9 m/s,内二次风速5～16 m/s,外二次风速8～20 m/s,外二次风叶片角度30°～75°时,DBC-OPCC型低NO_x旋流燃烧器射流的气固两相流流动特性。结果表明:两侧回流区随着内二次风速增加而向中心靠拢,其长度随着中心风速的增加而缩短。内、外二次风在一定程度上影响一次风的刚度以及回流区的范围和方向。外二次风叶片开度,与相邻两叶片之间中心区域的径向速度和出口流场轴向速度之间存在一定规律。
In order to improve burnout rate and the stable combustion performance of swirl burner and reduce NO_x emission numerically simulation( by fluent) was used to investigate the gas-solid two-phase flow characteristics of the DBC-OPCC type low NO_x swirl burner in the parameters range of the central wind speed 4 ～ 9 m/s,internal secondary air speed 5 ～ 16 m/s,external secondary air speed 8 ～ 20 m/s and the angle 30° ～ 75° of the outer secondary wind blade. The results show that: internal secondary air speed increases,the distance between the two sides of the recirculation zone toward the center. The length of the recirculation zone shortens with the increase of the central wind speed. The internal secondary air and external secondary air influence the stiffness of the primary air. The external secondary air speed affects the range and direction of the recirculation zone. The external secondary air blade opening affects the radial velocity and the axial velocity of the outlet flow field in the central region of the two blades.
In order to improve burnout rate and the stable combustion performance of swirl burner and reduce NO_x emission numerically simulation( by fluent) was used to investigate the gas-solid two-phase flow characteristics of the DBC-OPCC type low NO_x swirl burner in the parameters range of the central wind speed 4 ～ 9 m/s,internal secondary air speed 5 ～ 16 m/s,external secondary air speed 8 ～ 20 m/s and the angle 30° ～ 75° of the outer secondary wind blade. The results show that: internal secondary air speed increases,the distance between the two sides of the recirculation zone toward the center. The length of the recirculation zone shortens with the increase of the central wind speed. The internal secondary air and external secondary air influence the stiffness of the primary air. The external secondary air speed affects the range and direction of the recirculation zone. The external secondary air blade opening affects the radial velocity and the axial velocity of the outlet flow field in the central region of the two blades.
引文
1陈冬林,叶托,李恒.低NOx燃烧技术研究现状及进展[J].热力发电,2017,46(3):1-6Chen Donglin,Ye Tuo,Li Heng.Review on low NOxcombustion techniques[J].Thermal Power Generation,2017,46(3):1-6
2殷庆栋,魏颖莉,魏刚,等.国内外低NOx旋流燃烧器研究进展[J].电力科技与环保,2012,28(3):24-26Yin Qingdong,Wei Yingli,Wei Gang,et al.Research development of typical low NOxswirl burners[J].Electric Power Technology and Environmental Protection,2012,28(3):24-26
3米翠丽,樊孝华,魏刚,等.DRB-4Z型双调风旋流燃烧器出口流场的数值仿真研究[J].热力发电,2012,41(11):36-40Mi Cuili,Fan Xiaohua,Wei Gang,et al.Numerical simulation of outlet flow field of DRB-4Z type dual channel swirl burner[J].Thermal Power Generation.2012,41(11):36-40
4李翠超,胡斌,许颖梓.燃烧器湍流射流火焰传热和柔性密封防火的实验研究[J].科学技术与工程,2018,18(9):86-93Li Cuichao,Hu Bin,Xu Yingzi.Heat transfer and flexible seal fire proof test research of burner turbulent jet flame[J].Science Technology and Engineering,2018,18(9):86-93
5刘晓峰,贾建华.共轴同向旋流燃烧器扩口长度对回流区影响的数值模拟[J].科技与创新,2014(12):118-119Liu Xiaofeng,Jia Jianhua.The numerical simulation for the influence of the flaring length of the coaxial synthetic turbulent burner to the recirculaion zone[J].Science and Technology&Innovation,2014(12):118-119
6陈智超,李争起,靖剑平,等.中心给粉旋流燃烧器气固两相流动的数值模拟[J].机械工程学报,2009,45(12):305-309Chen Zhichao,Li Zhengqi,Jing Jianping,et al.Numerical simulation of gas-particle two phase flow field for swirl burner[J].Journal of Mechanical Engineering.2009,45(12):305-309
7 Thundil R R K,Ganesan V.Study on the effect of various parameters on flow development behind vane swirlers[J].International Journal of Thermal Sciences,2008,47:1204-1225
8白杰,尹莉萍,贾惟.湍流模型在Nex Gen燃烧器出口流场模拟中的应用[J].科学技术与工程,2017,17(36):228-235Bai Jie,Yin Liping,Jia Wei.Application of turbulence models to the simulation of the exit flow field of the Nex Gen burner[J].Science Technology and Engineering,2017,17(36):228-235
9杨培凯,庄智勇,陈伟博.旋流燃烧器空气流场特性CFD数值模拟[J].机电工程技术,2015,44(1):23-28,94Yang Peikai,Zhuang Zhiyong,Chen Weibo.Numerical simulation of air flow of turbulent burner based on FEA[J].Mechanical&Electrical Engineering Technology,2015,44(1):23-28,94
10解利方,高健中,王丽辉,等.浓淡燃烧式低氮燃烧器的数值模拟[J].煤气与热力,2017,37(3):54-58Jie Lifang,Gao Jianzhong,Wang Lihui,et al.Numerical simulation of low nitrogen burner with rich and lean combustion[J].Gas&Heat,2017,37(3):54-58
11 Schaffel N,Mancini M,Szlek A,et al.Novel conceptual design of a supercritical pulverized coal boiler utiliz-ing high temperature air combustion(HTAC)technology[J].Energy,2010,35(7):2752-2760
12 Li Z Q,Fan S,Su W,et al.Influence of the outer secondary air vane angle on the gas/particle flow characteristics near the double swirl flow burner region[J].Energy&Fuel,2010,24(7):3884-3889
2殷庆栋,魏颖莉,魏刚,等.国内外低NOx旋流燃烧器研究进展[J].电力科技与环保,2012,28(3):24-26Yin Qingdong,Wei Yingli,Wei Gang,et al.Research development of typical low NOxswirl burners[J].Electric Power Technology and Environmental Protection,2012,28(3):24-26
3米翠丽,樊孝华,魏刚,等.DRB-4Z型双调风旋流燃烧器出口流场的数值仿真研究[J].热力发电,2012,41(11):36-40Mi Cuili,Fan Xiaohua,Wei Gang,et al.Numerical simulation of outlet flow field of DRB-4Z type dual channel swirl burner[J].Thermal Power Generation.2012,41(11):36-40
4李翠超,胡斌,许颖梓.燃烧器湍流射流火焰传热和柔性密封防火的实验研究[J].科学技术与工程,2018,18(9):86-93Li Cuichao,Hu Bin,Xu Yingzi.Heat transfer and flexible seal fire proof test research of burner turbulent jet flame[J].Science Technology and Engineering,2018,18(9):86-93
5刘晓峰,贾建华.共轴同向旋流燃烧器扩口长度对回流区影响的数值模拟[J].科技与创新,2014(12):118-119Liu Xiaofeng,Jia Jianhua.The numerical simulation for the influence of the flaring length of the coaxial synthetic turbulent burner to the recirculaion zone[J].Science and Technology&Innovation,2014(12):118-119
6陈智超,李争起,靖剑平,等.中心给粉旋流燃烧器气固两相流动的数值模拟[J].机械工程学报,2009,45(12):305-309Chen Zhichao,Li Zhengqi,Jing Jianping,et al.Numerical simulation of gas-particle two phase flow field for swirl burner[J].Journal of Mechanical Engineering.2009,45(12):305-309
7 Thundil R R K,Ganesan V.Study on the effect of various parameters on flow development behind vane swirlers[J].International Journal of Thermal Sciences,2008,47:1204-1225
8白杰,尹莉萍,贾惟.湍流模型在Nex Gen燃烧器出口流场模拟中的应用[J].科学技术与工程,2017,17(36):228-235Bai Jie,Yin Liping,Jia Wei.Application of turbulence models to the simulation of the exit flow field of the Nex Gen burner[J].Science Technology and Engineering,2017,17(36):228-235
9杨培凯,庄智勇,陈伟博.旋流燃烧器空气流场特性CFD数值模拟[J].机电工程技术,2015,44(1):23-28,94Yang Peikai,Zhuang Zhiyong,Chen Weibo.Numerical simulation of air flow of turbulent burner based on FEA[J].Mechanical&Electrical Engineering Technology,2015,44(1):23-28,94
10解利方,高健中,王丽辉,等.浓淡燃烧式低氮燃烧器的数值模拟[J].煤气与热力,2017,37(3):54-58Jie Lifang,Gao Jianzhong,Wang Lihui,et al.Numerical simulation of low nitrogen burner with rich and lean combustion[J].Gas&Heat,2017,37(3):54-58
11 Schaffel N,Mancini M,Szlek A,et al.Novel conceptual design of a supercritical pulverized coal boiler utiliz-ing high temperature air combustion(HTAC)technology[J].Energy,2010,35(7):2752-2760
12 Li Z Q,Fan S,Su W,et al.Influence of the outer secondary air vane angle on the gas/particle flow characteristics near the double swirl flow burner region[J].Energy&Fuel,2010,24(7):3884-3889